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<a href="poll_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">  FUSE fsel: FUSE select example</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">  Copyright (C) 2008       SUSE Linux Products GmbH</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">  Copyright (C) 2008       Tejun Heo &lt;teheo@suse.de&gt;</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">  This program can be distributed under the terms of the GNU GPL.</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">  See the file COPYING.</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">*/</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#define FUSE_USE_VERSION 31</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#include &lt;config.h&gt;</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="fuse_8h.html">fuse.h</a>&gt;</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor">#include &lt;unistd.h&gt;</span></div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="preprocessor">#include &lt;ctype.h&gt;</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">#include &lt;errno.h&gt;</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor">#include &lt;time.h&gt;</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="preprocessor">#include &lt;pthread.h&gt;</span></div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="preprocessor">#include &lt;poll.h&gt;</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment"> * fsel_open_mask is used to limit the number of opens to 1 per file.</span></div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment"> * This is to use file index (0-F) as fh as poll support requires</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment"> * unique fh per open file.  Lifting this would require proper open</span></div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment"> * file management.</span></div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment"> */</span></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="keyword">static</span> <span class="keywordtype">unsigned</span> fsel_open_mask;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> fsel_hex_map[] = <span class="stringliteral">&quot;0123456789ABCDEF&quot;</span>;</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="keyword">static</span> <span class="keyword">struct </span>fuse *fsel_fuse;  <span class="comment">/* needed for poll notification */</span></div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="preprocessor">#define FSEL_CNT_MAX    10      </span><span class="comment">/* each file can store upto 10 chars */</span><span class="preprocessor"></span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#define FSEL_FILES      16</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="keyword">static</span> pthread_mutex_t fsel_mutex;      <span class="comment">/* protects notify_mask and cnt array */</span></div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="keyword">static</span> <span class="keywordtype">unsigned</span> fsel_poll_notify_mask;  <span class="comment">/* poll notification scheduled? */</span></div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="keyword">static</span> <span class="keyword">struct </span>fuse_pollhandle *fsel_poll_handle[FSEL_FILES]; <span class="comment">/* poll notify handles */</span></div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="keyword">static</span> <span class="keywordtype">unsigned</span> fsel_cnt[FSEL_FILES];   <span class="comment">/* nbytes stored in each file */</span></div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> fsel_path_index(<span class="keyword">const</span> <span class="keywordtype">char</span> *path)</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;{</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;        <span class="keywordtype">char</span> ch = path[1];</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        <span class="keywordflow">if</span> (strlen(path) != 2 || path[0] != <span class="charliteral">&#39;/&#39;</span> || !isxdigit(ch) || islower(ch))</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;                <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        <span class="keywordflow">return</span> ch &lt;= <span class="charliteral">&#39;9&#39;</span> ? ch - <span class="charliteral">&#39;0&#39;</span> : ch - <span class="charliteral">&#39;A&#39;</span> + 10;</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;}</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> fsel_getattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> stat *stbuf,</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;                        <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;{</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;        (void) fi;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;        <span class="keywordtype">int</span> idx;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        memset(stbuf, 0, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> stat));</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;        <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">&quot;/&quot;</span>) == 0) {</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                stbuf-&gt;st_mode = S_IFDIR | 0555;</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;                stbuf-&gt;st_nlink = 2;</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;        }</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        idx = fsel_path_index(path);</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        <span class="keywordflow">if</span> (idx &lt; 0)</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;                <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;        stbuf-&gt;st_mode = S_IFREG | 0444;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;        stbuf-&gt;st_nlink = 1;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        stbuf-&gt;st_size = fsel_cnt[idx];</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;}</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> fsel_readdir(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">void</span> *buf, <a class="code" href="fuse_8h.html#a7dd132de66a5cc2add2a4eff5d435660">fuse_fill_dir_t</a> filler,</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;                        off_t offset, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi,</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;                        <span class="keyword">enum</span> <a class="code" href="fuse_8h.html#af2bcf2a473b41b3cc8da8c079656a074">fuse_readdir_flags</a> flags)</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;{</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;        <span class="keywordtype">char</span> name[2] = { };</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        <span class="keywordtype">int</span> i;</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        (void) offset;</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        (void) fi;</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;        (void) flags;</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">&quot;/&quot;</span>) != 0)</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;                <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;        <span class="keywordflow">for</span> (i = 0; i &lt; FSEL_FILES; i++) {</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;                name[0] = fsel_hex_map[i];</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;                filler(buf, name, NULL, 0, 0);</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;        }</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;        <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;}</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> fsel_open(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;{</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;        <span class="keywordtype">int</span> idx = fsel_path_index(path);</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        <span class="keywordflow">if</span> (idx &lt; 0)</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;                <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;        <span class="keywordflow">if</span> ((fi-&gt;<a class="code" href="structfuse__file__info.html#ae7d31802727be19670193a411647bca5">flags</a> &amp; 3) != O_RDONLY)</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;                <span class="keywordflow">return</span> -EACCES;</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;        <span class="keywordflow">if</span> (fsel_open_mask &amp; (1 &lt;&lt; idx))</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;                <span class="keywordflow">return</span> -EBUSY;</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;        fsel_open_mask |= (1 &lt;&lt; idx);</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;        <span class="comment">/*</span></div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;<span class="comment">         * fsel files are nonseekable somewhat pipe-like files which</span></div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="comment">         * gets filled up periodically by producer thread and consumed</span></div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;<span class="comment">         * on read.  Tell FUSE as such.</span></div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;<span class="comment">         */</span></div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;        fi-&gt;<a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a> = idx;</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        fi-&gt;<a class="code" href="structfuse__file__info.html#a03b59a10e62963d9affa34ad78bd144a">direct_io</a> = 1;</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        fi-&gt;<a class="code" href="structfuse__file__info.html#a272022c57a6a79dd8f98ef597786e154">nonseekable</a> = 1;</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;}</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> fsel_release(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;{</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;        <span class="keywordtype">int</span> idx = fi-&gt;<a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>;</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;        (void) path;</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;        fsel_open_mask &amp;= ~(1 &lt;&lt; idx);</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;        <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;}</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> fsel_read(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size, off_t offset,</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;                     <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;{</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;        <span class="keywordtype">int</span> idx = fi-&gt;<a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>;</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;</div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;        (void) path;</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;        (void) offset;</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;        pthread_mutex_lock(&amp;fsel_mutex);</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;        <span class="keywordflow">if</span> (fsel_cnt[idx] &lt; size)</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;                size = fsel_cnt[idx];</div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;        printf(<span class="stringliteral">&quot;READ   %X transferred=%zu cnt=%u\n&quot;</span>, idx, size, fsel_cnt[idx]);</div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;        fsel_cnt[idx] -= size;</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;        pthread_mutex_unlock(&amp;fsel_mutex);</div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;        memset(buf, fsel_hex_map[idx], size);</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;        <span class="keywordflow">return</span> size;</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;}</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> fsel_poll(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi,</div><div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;                     <span class="keyword">struct</span> fuse_pollhandle *ph, <span class="keywordtype">unsigned</span> *reventsp)</div><div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;{</div><div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;        <span class="keyword">static</span> <span class="keywordtype">unsigned</span> polled_zero;</div><div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;        <span class="keywordtype">int</span> idx = fi-&gt;<a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>;</div><div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;        (void) path;</div><div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;</div><div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;        <span class="comment">/*</span></div><div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;<span class="comment">         * Poll notification requires pointer to struct fuse which</span></div><div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;<span class="comment">         * can&#39;t be obtained when using fuse_main().  As notification</span></div><div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;<span class="comment">         * happens only after poll is called, fill it here from</span></div><div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;<span class="comment">         * fuse_context.</span></div><div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;<span class="comment">         */</span></div><div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;        <span class="keywordflow">if</span> (!fsel_fuse) {</div><div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;                <span class="keyword">struct </span><a class="code" href="structfuse__context.html">fuse_context</a> *cxt = <a class="code" href="fuse_8h.html#a9a0f2a6603cb1e21f5e4c1aec84a3bcc">fuse_get_context</a>();</div><div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;                <span class="keywordflow">if</span> (cxt)</div><div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;                        fsel_fuse = cxt-&gt;<a class="code" href="structfuse__context.html#a8872cbd7e8d0269fb5cbd1ed40e60a19">fuse</a>;</div><div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;        }</div><div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;</div><div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;        pthread_mutex_lock(&amp;fsel_mutex);</div><div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;</div><div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;        <span class="keywordflow">if</span> (ph != NULL) {</div><div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;                <span class="keyword">struct </span>fuse_pollhandle *oldph = fsel_poll_handle[idx];</div><div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;</div><div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;                <span class="keywordflow">if</span> (oldph)</div><div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;                        <a class="code" href="fuse__common_8h.html#adf5027f8a38b2efc03858efd7fdc756a">fuse_pollhandle_destroy</a>(oldph);</div><div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;</div><div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;                fsel_poll_notify_mask |= (1 &lt;&lt; idx);</div><div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;                fsel_poll_handle[idx] = ph;</div><div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;        }</div><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;</div><div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;        <span class="keywordflow">if</span> (fsel_cnt[idx]) {</div><div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;                *reventsp |= POLLIN;</div><div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;                printf(<span class="stringliteral">&quot;POLL   %X cnt=%u polled_zero=%u\n&quot;</span>,</div><div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;                       idx, fsel_cnt[idx], polled_zero);</div><div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;                polled_zero = 0;</div><div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;        } <span class="keywordflow">else</span></div><div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;                polled_zero++;</div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;</div><div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;        pthread_mutex_unlock(&amp;fsel_mutex);</div><div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;        <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;}</div><div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;</div><div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;<span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="structfuse__operations.html">fuse_operations</a> fsel_oper = {</div><div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;        .<a class="code" href="structfuse__operations.html#ac39a0b7125a0e5001eb5ff42e05faa5d">getattr</a>        = fsel_getattr,</div><div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;        .readdir        = fsel_readdir,</div><div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;        .open           = fsel_open,</div><div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;        .release        = fsel_release,</div><div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;        .read           = fsel_read,</div><div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;        .poll           = fsel_poll,</div><div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;};</div><div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;</div><div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> *fsel_producer(<span class="keywordtype">void</span> *data)</div><div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;{</div><div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;        <span class="keyword">const</span> <span class="keyword">struct </span>timespec interval = { 0, 250000000 };</div><div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;        <span class="keywordtype">unsigned</span> idx = 0, nr = 1;</div><div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;</div><div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;        (void) data;</div><div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;</div><div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;        <span class="keywordflow">while</span> (1) {</div><div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;                <span class="keywordtype">int</span> i, t;</div><div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;</div><div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;                pthread_mutex_lock(&amp;fsel_mutex);</div><div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;</div><div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;                <span class="comment">/*</span></div><div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;<span class="comment">                 * This is the main producer loop which is executed</span></div><div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;<span class="comment">                 * ever 500ms.  On each iteration, it fills one byte</span></div><div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;<span class="comment">                 * to 1, 2 or 4 files and sends poll notification if</span></div><div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;<span class="comment">                 * requested.</span></div><div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;<span class="comment">                 */</span></div><div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;                <span class="keywordflow">for</span> (i = 0, t = idx; i &lt; nr;</div><div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;                     i++, t = (t + FSEL_FILES / nr) % FSEL_FILES) {</div><div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;                        <span class="keywordflow">if</span> (fsel_cnt[t] == FSEL_CNT_MAX)</div><div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;                                <span class="keywordflow">continue</span>;</div><div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;</div><div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;                        fsel_cnt[t]++;</div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;                        <span class="keywordflow">if</span> (fsel_fuse &amp;&amp; (fsel_poll_notify_mask &amp; (1 &lt;&lt; t))) {</div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;                                <span class="keyword">struct </span>fuse_pollhandle *ph;</div><div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;                                printf(<span class="stringliteral">&quot;NOTIFY %X\n&quot;</span>, t);</div><div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;                                ph = fsel_poll_handle[t];</div><div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;                                fuse_notify_poll(ph);</div><div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;                                <a class="code" href="fuse__common_8h.html#adf5027f8a38b2efc03858efd7fdc756a">fuse_pollhandle_destroy</a>(ph);</div><div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;                                fsel_poll_notify_mask &amp;= ~(1 &lt;&lt; t);</div><div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;                                fsel_poll_handle[t] = NULL;</div><div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;                        }</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;                }</div><div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;</div><div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;                idx = (idx + 1) % FSEL_FILES;</div><div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;                <span class="keywordflow">if</span> (idx == 0)</div><div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;                        nr = (nr * 2) % 7;      <span class="comment">/* cycle through 1, 2 and 4 */</span></div><div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;</div><div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;                pthread_mutex_unlock(&amp;fsel_mutex);</div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;</div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;                nanosleep(&amp;interval, NULL);</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;        }</div><div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;</div><div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;        <span class="keywordflow">return</span> NULL;</div><div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;}</div><div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;</div><div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div><div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;{</div><div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;        pthread_t producer;</div><div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;        pthread_attr_t attr;</div><div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;        <span class="keywordtype">int</span> ret;</div><div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;</div><div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;        errno = pthread_mutex_init(&amp;fsel_mutex, NULL);</div><div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;        <span class="keywordflow">if</span> (errno) {</div><div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;                perror(<span class="stringliteral">&quot;pthread_mutex_init&quot;</span>);</div><div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;                <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;        }</div><div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;</div><div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;        errno = pthread_attr_init(&amp;attr);</div><div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;        <span class="keywordflow">if</span> (errno) {</div><div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;                perror(<span class="stringliteral">&quot;pthread_attr_init&quot;</span>);</div><div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;                <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;        }</div><div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;</div><div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;        errno = pthread_create(&amp;producer, &amp;attr, fsel_producer, NULL);</div><div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;        <span class="keywordflow">if</span> (errno) {</div><div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;                perror(<span class="stringliteral">&quot;pthread_create&quot;</span>);</div><div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;                <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;        }</div><div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;</div><div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;        ret = <a class="code" href="fuse_8h.html#ac99b844cee7aaa8fb4e35df5b5488d82">fuse_main</a>(argc, argv, &amp;fsel_oper, NULL);</div><div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;</div><div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;        pthread_cancel(producer);</div><div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;        pthread_join(producer, NULL);</div><div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;</div><div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;        <span class="keywordflow">return</span> ret;</div><div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;}</div><div class="ttc" id="structfuse__file__info_html_a45314d0b92a8d4c9de33d996aa59ada8"><div class="ttname"><a href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fuse_file_info::fh</a></div><div class="ttdeci">uint64_t fh</div><div class="ttdef"><b>Definition:</b> <a href="fuse__common_8h_source.html#l00072">fuse_common.h:72</a></div></div>
<div class="ttc" id="structfuse__file__info_html_a03b59a10e62963d9affa34ad78bd144a"><div class="ttname"><a href="structfuse__file__info.html#a03b59a10e62963d9affa34ad78bd144a">fuse_file_info::direct_io</a></div><div class="ttdeci">unsigned int direct_io</div><div class="ttdef"><b>Definition:</b> <a href="fuse__common_8h_source.html#l00046">fuse_common.h:46</a></div></div>
<div class="ttc" id="fuse_8h_html_af2bcf2a473b41b3cc8da8c079656a074"><div class="ttname"><a href="fuse_8h.html#af2bcf2a473b41b3cc8da8c079656a074">fuse_readdir_flags</a></div><div class="ttdeci">fuse_readdir_flags</div><div class="ttdef"><b>Definition:</b> <a href="fuse_8h_source.html#l00042">fuse.h:42</a></div></div>
<div class="ttc" id="structfuse__file__info_html"><div class="ttname"><a href="structfuse__file__info.html">fuse_file_info</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse__common_8h_source.html#l00037">fuse_common.h:37</a></div></div>
<div class="ttc" id="structfuse__operations_html"><div class="ttname"><a href="structfuse__operations.html">fuse_operations</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse_8h_source.html#l00299">fuse.h:299</a></div></div>
<div class="ttc" id="structfuse__file__info_html_ae7d31802727be19670193a411647bca5"><div class="ttname"><a href="structfuse__file__info.html#ae7d31802727be19670193a411647bca5">fuse_file_info::flags</a></div><div class="ttdeci">int flags</div><div class="ttdef"><b>Definition:</b> <a href="fuse__common_8h_source.html#l00039">fuse_common.h:39</a></div></div>
<div class="ttc" id="structfuse__operations_html_ac39a0b7125a0e5001eb5ff42e05faa5d"><div class="ttname"><a href="structfuse__operations.html#ac39a0b7125a0e5001eb5ff42e05faa5d">fuse_operations::getattr</a></div><div class="ttdeci">int(* getattr)(const char *, struct stat *, struct fuse_file_info *fi)</div><div class="ttdef"><b>Definition:</b> <a href="fuse_8h_source.html#l00311">fuse.h:311</a></div></div>
<div class="ttc" id="structfuse__file__info_html_a272022c57a6a79dd8f98ef597786e154"><div class="ttname"><a href="structfuse__file__info.html#a272022c57a6a79dd8f98ef597786e154">fuse_file_info::nonseekable</a></div><div class="ttdeci">unsigned int nonseekable</div><div class="ttdef"><b>Definition:</b> <a href="fuse__common_8h_source.html#l00060">fuse_common.h:60</a></div></div>
<div class="ttc" id="fuse__common_8h_html_adf5027f8a38b2efc03858efd7fdc756a"><div class="ttname"><a href="fuse__common_8h.html#adf5027f8a38b2efc03858efd7fdc756a">fuse_pollhandle_destroy</a></div><div class="ttdeci">void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)</div><div class="ttdef"><b>Definition:</b> <a href="fuse__lowlevel_8c_source.html#l01766">fuse_lowlevel.c:1766</a></div></div>
<div class="ttc" id="fuse_8h_html"><div class="ttname"><a href="fuse_8h.html">fuse.h</a></div></div>
<div class="ttc" id="fuse_8h_html_a7dd132de66a5cc2add2a4eff5d435660"><div class="ttname"><a href="fuse_8h.html#a7dd132de66a5cc2add2a4eff5d435660">fuse_fill_dir_t</a></div><div class="ttdeci">int(* fuse_fill_dir_t)(void *buf, const char *name, const struct stat *stbuf, off_t off, enum fuse_fill_dir_flags flags)</div><div class="ttdef"><b>Definition:</b> <a href="fuse_8h_source.html#l00082">fuse.h:82</a></div></div>
<div class="ttc" id="structfuse__context_html_a8872cbd7e8d0269fb5cbd1ed40e60a19"><div class="ttname"><a href="structfuse__context.html#a8872cbd7e8d0269fb5cbd1ed40e60a19">fuse_context::fuse</a></div><div class="ttdeci">struct fuse * fuse</div><div class="ttdef"><b>Definition:</b> <a href="fuse_8h_source.html#l00779">fuse.h:779</a></div></div>
<div class="ttc" id="structfuse__context_html"><div class="ttname"><a href="structfuse__context.html">fuse_context</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse_8h_source.html#l00777">fuse.h:777</a></div></div>
<div class="ttc" id="fuse_8h_html_a9a0f2a6603cb1e21f5e4c1aec84a3bcc"><div class="ttname"><a href="fuse_8h.html#a9a0f2a6603cb1e21f5e4c1aec84a3bcc">fuse_get_context</a></div><div class="ttdeci">struct fuse_context * fuse_get_context(void)</div><div class="ttdef"><b>Definition:</b> <a href="fuse_8c_source.html#l04557">fuse.c:4557</a></div></div>
<div class="ttc" id="fuse_8h_html_ac99b844cee7aaa8fb4e35df5b5488d82"><div class="ttname"><a href="fuse_8h.html#ac99b844cee7aaa8fb4e35df5b5488d82">fuse_main</a></div><div class="ttdeci">#define fuse_main(argc, argv, op, private_data)</div><div class="ttdef"><b>Definition:</b> <a href="fuse_8h_source.html#l00855">fuse.h:855</a></div></div>
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